Parallel dividers



(ModeL) J. B. TETLEY.

PARALLEL DIVIDERS. No. 279.460.g Patented June 12,1883.

z WITNESSES: INVENTOR: WM; fW/M A Y Wu ATTORNEYS.

' UNITED STATES PATENT OFFICE;

JAMES B. TETLEY, OF PITTSBURG, PENNSYLVANIA.

PARALLEL DIVIDERS.

SPECIFICATION forming part of Letters Patent No. 279,460, dated June 12, 1883.

Application filed April 5, 1883. (ModeL) which similar letters of reference indicate cor responding parts in all the figures.

Figure 1 is a side elevation of my improved parallel dividers. Fig. 2is an elevationof the same in a plane at right angles to that of Fig. 1, and Fig. 3 is a detail of one of the point and its arm.

The points a are each provided with an arm, I), at the upper end, where they are jointed to the lower ends of the legs 0, said arms being at right angles to the points and also being projected toward the opposite leg. These arms are connected by a bar, d, to a point, e, on the opposite leg' of the dividers, which bears the same relation to the pivot-center f that pivots g bear to pivots h, except that the arms b are longer than the radius e f, because the legsc are not radial to center f. The arm b' and its connecting-bar d of the respective legs are placed on opposite sides of the dividers, so that they do not interfere with each other in closing the legs together.

The improved contrivance may be applied to almost any pair of common dividers, with or without a wing, and they can be used for any work that other dividers are used for, as there is no projection outside to interfere with anything. They can be used for inside parallel calipers, if the outside edge of the movable points be true, the taper being on the inside, and may have loose and needle points or not, as may be preferred.

Having thus described my invention, I claim as new and desire to secure by Letters Patent Parallel dividers consisting of the pointers a a, the leg 0 0, having the pivotal center f, the inner arms, I) b, at right angles to said pointers, and the pivoted bars (I (1, connecting the leg-points c with the free ends of arms, as shown and described.

JAMES BITETLEY.

Witnesses:

J OHN O BRIEN, MICHAEL MAHoNY. 

